研究了一种变质量柔绳上升和下降的运动规律。

The law of variable mass motion of a soft rope is studied.

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在气垫导轨上研究了变质量物体在变力作用下的运动规律。

The motion of variable mass system under variable force is studied using air track.

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在气垫导轨上研究了变质量物体在变力作用下的运动规律。

The motion of variable mass system under variable force is studied using air track.

youdao